Toedtoes mentioned it, but I wanted to call it out. You can get many Bs, Cs, and just big trucks into a normal spot by backing the rear end way out over a perimeter spot. We had a 31.5' Class C (in my sig), and it would fit into some single spots if I could back the overhang over the grass.
Just check carefully before you back b/c sometimes there will be obstacles that aren't easy to see. E.g., there's a lot here where the ground slopes away from the curb, but in the most convenient parking spot there's an electric transformer a few feet back that sticks up just a little higher than the curb. Painted green, it's almost hidden in the dark if your lights aren't shining on it.
And don't forget to check the roof area when backing. As a newbie, I was so concerned with making sure I was clear to the rear that I didn't notice how a tree off to the side had limbs sticking out far enough to hit me on the side, way up high near the roof. Didn't cause any damage, but I got lucky.
